guys,

Hardman Bros in Melbourne are the people that made the gears:
http://www.hardmanbros.com.au/

Talk to Mark or Leigh.

From what I have heard they do not have any spare stock but would consider a group buy.

There are 3 sets of gears that they have done:
2.85 for earlier Pajeros/monteros
3.15 for Gen 2
3.15 for Gen 3

I have a set in both my Gen 2.5 & Gen3

It is possible that the Gen 3 gears would also fit the Gen 4 vehicles , as Mitsu part numbers have revealed similarities, however big doubt exists for the NT Diesel (Aus). There does not appear to be anyone that has installed these gears in a Gen 4 though.

BTW it was mentioned on the Aus forum that Hardman Bros bought out Marks 4wd Adaptors in Melbourne.

Good luck.